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[SCSI] fix crash when disconnecting usb storage 

__scsi_remove_device() in scsi_forget_host() is executed out of scan_mutex
and races with scsi_destroy_sdev() <- scsi_sysfs_add_devices() <-
scsi_finish_async_scan().  The result is use after free and/or double
free, oops.

The fix is simple, move scsi_forget_host() under scan_mutex.

scsi_forget_host() is just sequence of __scsi_remove_device().  All
another calls of __scsi_remove_device() are made under scan_mutex.  So
that it is safe.

Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Alexey Kuznetsov 2009-11-17 14:10:11 -08:00 committed by James Bottomley
parent 860dc73608
commit 4e46bf8997
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/hosts.c
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@ -164,8 +164,8 @@ void scsi_remove_host(struct Scsi_Host *shost)
return;
}
spin_unlock_irqrestore(shost->host_lock, flags);
mutex_unlock(&shost->scan_mutex);
scsi_forget_host(shost);
mutex_unlock(&shost->scan_mutex);
scsi_proc_host_rm(shost);
spin_lock_irqsave(shost->host_lock, flags);